GPT-5.1-Codex alternatives
Models from providers other than OpenAI, ranked by similarity to GPT-5.1-Codex — capability overlap, context window proximity, and per-million-token price. Refreshed nightly.
Frequently asked questions
What are the best alternatives to GPT-5.1-Codex?
The closest alternatives to GPT-5.1-Codex are Gemini 2.5 Pro, Gemini 2.5 Pro Preview 06-05 and Gemini 2.5 Pro Preview 05-06. They are ranked by capability overlap, context-window similarity, and blended price.
Why might I switch from GPT-5.1-Codex?
Common reasons: reducing vendor lock-in, finding cheaper input/output pricing for your specific workload mix, or wanting capabilities GPT-5.1-Codex lacks (vision, tool use, JSON mode). Compare any two side-by-side from this page.
How is "alternative" defined here?
An alternative is a model from a different provider than OpenAI with similar capabilities, comparable context window, and comparable per-million-token pricing. Same-provider variants (e.g. smaller siblings of GPT-5.1-Codex) are excluded — for those, use the cost calculator and compare pages.